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                [Usaco2016 Dec]Moocast                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>Farmer John's N cows (1&le;N&le;1000) want to organize an emergency &quot;moo-cast&quot; system for broadcasting i</div>
<div>mportant messages among themselves.Instead of mooing at each-other over long distances, the cows dec</div>
<div>ide to equip themselves with walkie-talkies, one for each cow. These walkie-talkies each have a limi</div>
<div>ted transmission radius, but cows can relay messages to one-another along a path consisting of sever</div>
<div>al hops, so it is not necessary for every cow to be able to transmit directly to every other cow.The</div>
<div>&nbsp;cows need to decide how much money to spend on their walkie-talkies. If they spend $X, they will ea</div>
<div>ch get a walkie-talkie capable of transmitting up to a distance of X??&radic;X. That is, the squared dist</div>
<div>ance between two cows must be at most X for them to be able to communicate.Please help the cows dete</div>
<div>rmine the minimum integer value of X such that a broadcast from any cow will ultimately be able to r</div>
<div>each every other cow.</div>
<div>
<div>FJ的N头牛(1&le;N&le;1000)为了在他们之间传播信息, 想要组织一个&quot;哞哞广播&quot;系统. 奶牛们决定去用步话机装备自</div>
<div>己而不是在很远的距离之外互相哞哞叫, 所以每一头奶牛都必须有一个步话机. 这些步话机都有一个限制传播半径</div>
<div>, 但是奶牛们可以间接地通过中间奶牛传播信息, 所以并不是每头牛都必须直接向其他每一头奶牛连边. 奶牛们需</div>
<div>要去决定多少钱花在步话机上, 如果他们花了$X, 那么他们都将会得到sqrt(x)距离的步话机. 所以, 两头牛之间</div>
<div>的欧几里得距离最多是X. 请帮助奶牛们找到最小的X使得图是强连通的.、</div>
</div>
<div></div>
<p></p></p><hr/><h3>输入格式</h3><p><div>The first line of input contains N</div>
<div>The next NN lines each contain the xx and yy coordinates of a single cow.&nbsp;</div>
<div>These are both integers in the range 0&hellip;25,000</div>
<div></div>
<p></p></p><hr/><h3>输出格式</h3><p><div>Write a single line of output containing the integer X giving the minimum amount the cows must spend&nbsp;</div>
<div>on walkie-talkies.</div>
<div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>4
1 3
5 4
7 2
6 1</pre><hr/><h3>样例输出</h3><pre>17</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold&&鸣谢MrMorning提供译文</p>
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